C / C++ / MFC

<br />
*********************SystemHook.h**********************<br />
#ifdef SYSTEMHOOK_EXPORTS<br />
#define SYSTEMHOOK_API __declspec(dllexport)<br />
#else<br />
#define SYSTEMHOOK_API __declspec(dllimport)<br />
#endif<br />
<br />
// This class is exported from the SystemHook.dll<br />
class SYSTEMHOOK_API CSystemHook {<br />
public:<br />
	CSystemHook(void);<br />
	// TODO: add your methods here.<br />
};<br />
SYSTEMHOOK_API LRESULT CALLBACK KeyboardProc(int code,WPARAM wParam,LPARAM lParam);<br />
SYSTEMHOOK_API int WINAPI InstallHook (HWND hWnd, BOOL bCode );<br />
*******************************************************<br />
<br />
*********************SystemHook.cpp**********************<br />
#include "stdafx.h"<br />
#include "SystemHook.h"<br />
<br />
#define ID_CMD_KEYPRESSED	WM_USER+200<br />
<br />
// Globals for this module <br />
HWND     ghWndMain;      // Handle to main window -- used to post msgs<br />
<br />
static HHOOK    hHook;          // A handle to our installed hook <br />
static BOOL     bHookInstalled; // TRUE if hook has been installed <br />
<br />
HINSTANCE ghDLLInst;   // Handle to the DLL's instance.  Set in DllMain.<br />
<br />
BOOL APIENTRY DllMain( HANDLE hModule, <br />
                       DWORD  ul_reason_for_call, <br />
                       LPVOID lpReserved<br />
					 )<br />
{<br />
    switch (ul_reason_for_call)<br />
	{<br />
		case DLL_PROCESS_ATTACH:<br />
		case DLL_THREAD_ATTACH:<br />
		case DLL_THREAD_DETACH:<br />
		case DLL_PROCESS_DETACH:<br />
			break;<br />
    }<br />
	ghDLLInst=(HINSTANCE)hModule;<br />
    return TRUE;<br />
}<br />
<br />
// This is the constructor of a class that has been exported.<br />
// see SystemHook.h for the class definition<br />
CSystemHook::CSystemHook()<br />
{ <br />
	return; <br />
}<br />
<br />
SYSTEMHOOK_API LRESULT CALLBACK KeyboardProc(<br />
	int code,       // hook code<br />
	WPARAM wParam,  // virtual-key code<br />
	LPARAM lParam)  // keystroke-message information<br />
{<br />
	if ( code >= 0 ) <br />
	{ <br />
		// Check to see if it's a key we're looking for <br />
		if (GetKeyState(VK_SHIFT) < 0 && GetKeyState(VK_CONTROL) < 0) <br />
		{ <br />
			switch (wParam) <br />
			{ <br />
			case VK_F9:<br />
				if (HIWORD(lParam) & 0x8000) <br />
					PostMessage(ghWndMain, WM_COMMAND, ID_CMD_KEYPRESSED, 0L);<br />
				return 1;<br />
			} <br />
		}<br />
        }<br />
 // If we haven't returned 1 by the time we get here, then we <br />
	// need to pass on the message to CallNextHookEx. <br />
return (int)CallNextHookEx(hHook, code, wParam, lParam); <br />
}<br />
<br />
SYSTEMHOOK_API int WINAPI InstallHook (HWND hWnd, BOOL bCode )<br />
{ <br />
    int nReturn = 1;<br />
	ghWndMain = hWnd;  // Store app's window handle in DLL global variable <br />
 <br />
    // Make sure that we are installing/removing in the proper order <br />
    if (bCode == bHookInstalled) <br />
        return 0; <br />
 <br />
    if (bCode) <br />
    { <br />
        hHook=(HHOOK)SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,ghDLLInst,0); <br />
        if (!hHook) <br />
            return 0; <br />
        bHookInstalled = TRUE; <br />
    } <br />
    else <br />
    { <br />
        nReturn = UnhookWindowsHookEx(hHook); <br />
        bHookInstalled = FALSE; <br />
    } <br />
    return nReturn; <br />
}<br />
*******************************************************<br />

<br />
void CWinSchedulerView::OnInitialUpdate() <br />
{<br />
CFormView::OnInitialUpdate();<br />
InstallHook(m_hWnd,TRUE);<br />
}<br />
void CWinSchedulerView::OnDestroy() <br />
{<br />
	CFormView::OnDestroy();<br />
	InstallHook(m_hWnd,FALSE);<br />
}<br />
<br />
BOOL CWinSchedulerView::OnCommand(WPARAM wParam, LPARAM lParam) <br />
{<br />
	// TODO: Add your specialized code here and/or call the base class<br />
	if(wParam==ID_CMD_KEYPRESSED)<br />
		MessageBox("Ctrl+Shift+F9");<br />
	<br />
	return CFormView::OnCommand(wParam, lParam);<br />
}<br />

<br />
HHOOK m_hhk;<br />
static LRESULT CALLBACK KeyboardProc(int code,WPARAM wParam,LPARAM lParam);<br />
<br />
void CWinSchedulerView::OnInitialUpdate() <br />
{<br />
        CFormView::OnInitialUpdate();<br />
	m_hhk = SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,NULL,GetCurrentThreadId());<br />
}<br />
<br />
static LRESULT CALLBACK KeyboardProc(<br />
	int code,       // hook code<br />
	WPARAM wParam,  // virtual-key code<br />
	LPARAM lParam)  // keystroke-message information<br />
{<br />
	if (code < 0 || code != HC_ACTION)<br />
		return CallNextHookEx(m_hhk, code, wParam, lParam);<br />
	if (wParam == VK_F1)<br />
	{<br />
		AfxMessageBox("F1");<br />
	}<br />
	return CallNextHookEx(m_hhk, code, wParam, lParam);<br />
}<br />
<br />
void CWinSchedulerView::OnDestroy() <br />
{<br />
	CFormView::OnDestroy();<br />
	<br />
	UnhookWindowsHookEx(m_hhk);	<br />
}<br />